MIL-PRF-22710 Switches, Code Indicating Wheel \(Printed Circuit\), Thumbwheel And Push-Button, General Specification ForThis specification covers the general requirements for illuminated and non-illuminated, thumbwheel \(see 6.4.1\), and push-button, printed circuit rotary switches having unsealed and sealed modules and the associated hardware. These switches are designed for low power alternating current \(ac\) and direct current \(dc\) switching applications for use in electronic and communication equipment. Procurement of switches and mounting hardware will require additional data, giving detailed electrical and mechanical requirements, tolerances, and applicable additions and exceptions to the general requirements and tests specified herein \(see 6.2\).

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MIL-PRF-22710H

4.5.19 Sand and dust (when applicable, see 3.1 and 6.2.2) (see 3.22). Switches shall be tested in accordance

with method 110 of MIL-STD-202, test condition B. During the test, the switches shall be operated for 1,000 cycles.

The cycling rate shall not exceed 10 cycles of operation per minute. Switches shall be examined for evidence of

mechanical and electrical damage and change in operating torque.

4.5.20 Explosion (when applicable, see 3.1 and 6.2.2) (see 3.23). Switches shall be tested in accordance with

method 109 of MIL-STD-202. The following detail shall apply: Electrical load: Switches shall be operated with the dc

resistive load specified for atmospheric pressure (see 3.1).

FIGURE 3. Block diagram of switch shielding efficiency.

4.5.21 Salt spray (corrosion) (see 3.24). Switches and their mounting hardware, assembled with their mounting

means, shall be tested in accordance with method 101 of MIL-STD-202. The following details shall apply:

a. Test-condition letter: B.

b. Measurements after exposure: Not applicable.

After the test, switches and mounting hardware shall be examined for evidence of excessive corrosion. Mounting

hardware shall be removed.